emergence of direct p-phase from seismic ambient noise in dehdasht area

The theoretical studies have revealed that cross correlation of seismic ambient noises can estimate the green’s functions between a pair of stations (e.g. snieder, 2004; wapenaar, 2004). this idea encourages the researchers to do study using seismic ambient noise to determine the velocity structure.several studies extracted the surface waves from seismic ambient noise and presented the corresponding surface wave tomography (e.g. sabra et al., 2005; bensen et al., 2007). in contrast, extraction of the body waves from the seismic ambient noise is still a critical issue, because the amplitude of the surface waves is dominant compared to the amplitudeof body waves. however, some studies can retrieve the direct p wave (e.g. roux, et al., 2005; nakata et al., 2015, 2016) and reflected p wave (e.g. draganov et al., 2009) from seismic ambient noises in local scale.